9904661 has 4 divisors (see below), whose sum is σ = 10666572. Its totient is φ = 9142752.

The previous prime is 9904649. The next prime is 9904667. The reversal of 9904661 is 1664099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1664099 = 1289 ⋅1291.

It can be written as a sum of positive squares in 2 ways, for example, as 4024036 + 5880625 = 2006^2 + 2425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9904661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9904667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380936 + ... + 380961.

It is an arithmetic number, because the mean of its divisors is an integer number (2666643).

Almost surely, 2^9904661 is an apocalyptic number.

It is an amenable number.

9904661 is a deficient number, since it is larger than the sum of its proper divisors (761911).

9904661 is a wasteful number, since it uses less digits than its factorization.

9904661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761910.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 9904661 is about 3147.1671388727. The cubic root of 9904661 is about 214.7566093764.

The spelling of 9904661 in words is "nine million, nine hundred four thousand, six hundred sixty-one".